Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f00d8c5f619c371…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 05:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79c4bb8f6950100ef3e8ff00f5a50d91 SHA-1: 5e4efa7e1218f35ff63d241dd253838466e71c8c SHA-256: 9f00d8c5f619c371a3e43be07d681e84431c644885d5579856c37888dfaf2b0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vikingpaint.com/user_file/file/xepinipi.pdf
    • http://taiwanquinoafamily.com/shopadmin/upload/files/dovogaxomukuseminu.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/89ab6243ad907f2bb11eb34b64e4795a/lekajerevu.pdf
    • http://qdsenfeng.com/data/files/zulokiwamuroka.pdf
    • http://fine-cottage.ru/userfiles/files/75952546479.pdf
    • http://auksozvynas.lt/userfiles/file/sumejejejuzakefososer.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e890c977f5---nakugowovesaweritawo.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a9a1a6cba---wetixutisazafawepagul.pdf
    • http://sabaispa.net/userfiles/file/21625165300.pdf
    • https://serihosting.com/calisma2/files/uploads/gokidujijepajusut.pdf
    • https://digireg.it/upload/27330977302.pdf
    • http://stonebreaker.at/tamov.pdf
    • https://bepcongnghiepphuchung.vn/userfiles/file/wesuzusorelixokamejuwive.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3ffed444f6173acf98056606e0a0bc32/3286509467.pdf
    • https://thaiwoodengames.com/files/upload/files/28229770564.pdf
    • http://thegioituigiay.net/uploads/files/rapigeror.pdf
    • http://toitureetfacade.fr/data/Files/mobeki.pdf
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/janokiwub.pdf
    • http://ducthanhtam.com/uploads/userfiles/file/15402202679.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/burugigefugepezeparavudi.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614123c3ada49---81730306465.pdf
    • http://metisentry.net/ckfinder/userfiles/files/47448540687.pdf
    • https://mundolibre.cl/uploads/userfiles/files/padifarewisel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=clash+of+clans+unlimited+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DC 16792 bytes
font_01_sfnt_off0000ccee.bin
77f7dab1fb61495c2221f1986d6610015126dd0804c319d161c415d3170e0cc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 15360 bytes
font_02_sfnt_off0000f3a3.bin
a6b08fecf028f840f451d84cd8eee72aa540a53d2ef0311ff9aedaa4e580f066
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10864 bytes